//using System;
//using System.Collections.Generic;
//using System.Globalization;
//using System.Text;
//using System.Text.RegularExpressions;
//using System.Reflection;

public class Email{

   public static void Main(){
        //"\w+@(\w+\.)+\w+"
        //System.out.println(r.IsMatch("j@by.com"));
        //System.out.println(r.IsMatch("jn@b.com"));
        //System.out.println(r.IsMatch("o47@l.com"));
   }
}